First Report of Leaf Blotch of Salix babylonica Caused by Botryosphaeria dothidea in China.
Identifieur interne : 000205 ( Main/Exploration ); précédent : 000204; suivant : 000206First Report of Leaf Blotch of Salix babylonica Caused by Botryosphaeria dothidea in China.
Auteurs : Yue Ju [Oman] ; Yuan-Zhi Si [Oman] ; De-Wei Li ; Wu Xu [Oman] ; Jian-Wei Sun [Oman] ; Li-Hua Zhu [République populaire de Chine]Source :
- Plant disease [ 0191-2917 ] ; 2020.
Abstract
Salix babylonica L. (weeping willow) is an important ornamental tree commonly planted in China. Since 2018, a new disease with a high incidence has been observed on S. babylonica at the campus of Nanjing Forestry University (NFU), Nanjing, Jiangsu, China. The symptoms began as small dark brown lesions formed along the leaf margins and tips; and later became gray to brown in the center with dark brown borders. Small samples (3 to 4 mm2) from the lesion margins were surface-sterilized with 75% ethanol for 30 s and 1% NaClO for 90 s. Subsequently samples were, rinsed with sterile H2O, plated on potato dextrose agar (PDA) and incubated at 25°C. The same fungus was isolated in 95% of the samples. Pure cultures were obtained by monosporic isolation. A representative isolate, NFS1 was used for morphological and molecular characterization and deposited in China's Forestry Culture Collection Center (cfcc 54212). On PDA, colonies were initially white and gradually became grayish-green to dark gray from the center to the edge. After 1 week, colonies turned dark, and after 3 weeks black pycnidia developed on the surface of media. Conidia were one-celled, hyaline, smooth, and fusoid to ellipsoid. Conidia measurements were 23.0 ± 1.9 × 5.8 ± 0.7 µm (n = 50). The morphology matched the description of Botryosphaeria dothidea (Slippers et al. 2004). For an accurate identification, genomic DNA of NSF1 was extracted to amplify the internal transcribed spacer (ITS) region, the transcription eongation factor (tefa-1), beta-tubulin (β-tub), the large subunit (LSU), and small subunit (SSU) genes with the specific primers ITS1/ITS4 (White et al. 1990), EF1-728F/EF1-986R (Carbone and Kohn, 1999), βt2a/βt2b (Glass and Donaldson, 1995), LR0R/LR05 (Schoch et al. 2009), and NS1/NS4 (White et al. 1990), respectively. The sequences were deposited in GenBank (Accession Nos. MN826233 for ITS, MN855215 for tefa-1, MN855216 for β-tub, MN886965 for LSU, and MN886966 for SSU). A BLAST search of GenBank showed that the ITS, tefa-1, β-tub, LSU and SSU sequences of NSF1 were similar to those of B. dothidea KY788304 (Identity = 527/532; 99%), MG459974 (Identity = 247/247; 100%), MH724212 (Identity = 404/404; 100%), DQ377850 (Identity = 865/867; 99%), and KX091154 (Identity = 1,043/1,045; 99%), respectively. A maximum likelihood and Bayesian posterior probability-based phylogenetic analyses using IQ-tree v. 1.6.8 and Mr. Bayes v. 3.2.6 with the concatenated sequences (ITS, tefa-1, β-tub, LSU, and SSU) placed NFS1 in the clade of B. dothidea. Based on the multi-gene phylogeny and morphology, NFS1 isolate was identified as B. dothidea. To fulfill Koch's postulates, 20 detached and 20 attached healthy 10-week-old leaves from three 30-year-old S. babylonica plants at the campus of NFU were inoculated with 5-mm mycelial plugs of isolate NFS1 of 3-day-old cultures grown on PDA. Control leaves were treated with agar plugs. The detached inoculated leaves were placed in Petri dishes on a piece of wet filter paper and incubated at 25°C. The attached leaves were enclosed in a plastic bag along with the branches with a wet cotton ball inside. Sterile H2O was sprayed into the plastic bags twice daily to keep moisture conditions and incubated for 5 days. The experiment was repeated two times. Within 5 days, all the inoculated points showed lesions similar to those obsrved in the field, whereas controls were asymptomatic. The same fungus was re-isolated from these lesions with a frequency of 100%. B. dothidea has been reported to infect a broad range of hosts, including S. babylonica in the USA (Grand 1985). This is the first report of B. dothidea on S. babylonica in China. This finding provides crucial information on this high risk disease to willow and basis for identifying management strategies.
DOI: 10.1094/PDIS-06-20-1284-PDN
PubMed: 32729805
Affiliations:
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<front><div type="abstract" xml:lang="en">Salix babylonica L. (weeping willow) is an important ornamental tree commonly planted in China. Since 2018, a new disease with a high incidence has been observed on S. babylonica at the campus of Nanjing Forestry University (NFU), Nanjing, Jiangsu, China. The symptoms began as small dark brown lesions formed along the leaf margins and tips; and later became gray to brown in the center with dark brown borders. Small samples (3 to 4 mm2) from the lesion margins were surface-sterilized with 75% ethanol for 30 s and 1% NaClO for 90 s. Subsequently samples were, rinsed with sterile H2O, plated on potato dextrose agar (PDA) and incubated at 25°C. The same fungus was isolated in 95% of the samples. Pure cultures were obtained by monosporic isolation. A representative isolate, NFS1 was used for morphological and molecular characterization and deposited in China's Forestry Culture Collection Center (cfcc 54212). On PDA, colonies were initially white and gradually became grayish-green to dark gray from the center to the edge. After 1 week, colonies turned dark, and after 3 weeks black pycnidia developed on the surface of media. Conidia were one-celled, hyaline, smooth, and fusoid to ellipsoid. Conidia measurements were 23.0 ± 1.9 × 5.8 ± 0.7 µm (n = 50). The morphology matched the description of Botryosphaeria dothidea (Slippers et al. 2004). For an accurate identification, genomic DNA of NSF1 was extracted to amplify the internal transcribed spacer (ITS) region, the transcription eongation factor (tefa-1), beta-tubulin (β-tub), the large subunit (LSU), and small subunit (SSU) genes with the specific primers ITS1/ITS4 (White et al. 1990), EF1-728F/EF1-986R (Carbone and Kohn, 1999), βt2a/βt2b (Glass and Donaldson, 1995), LR0R/LR05 (Schoch et al. 2009), and NS1/NS4 (White et al. 1990), respectively. The sequences were deposited in GenBank (Accession Nos. MN826233 for ITS, MN855215 for tefa-1, MN855216 for β-tub, MN886965 for LSU, and MN886966 for SSU). A BLAST search of GenBank showed that the ITS, tefa-1, β-tub, LSU and SSU sequences of NSF1 were similar to those of B. dothidea KY788304 (Identity = 527/532; 99%), MG459974 (Identity = 247/247; 100%), MH724212 (Identity = 404/404; 100%), DQ377850 (Identity = 865/867; 99%), and KX091154 (Identity = 1,043/1,045; 99%), respectively. A maximum likelihood and Bayesian posterior probability-based phylogenetic analyses using IQ-tree v. 1.6.8 and Mr. Bayes v. 3.2.6 with the concatenated sequences (ITS, tefa-1, β-tub, LSU, and SSU) placed NFS1 in the clade of B. dothidea. Based on the multi-gene phylogeny and morphology, NFS1 isolate was identified as B. dothidea. To fulfill Koch's postulates, 20 detached and 20 attached healthy 10-week-old leaves from three 30-year-old S. babylonica plants at the campus of NFU were inoculated with 5-mm mycelial plugs of isolate NFS1 of 3-day-old cultures grown on PDA. Control leaves were treated with agar plugs. The detached inoculated leaves were placed in Petri dishes on a piece of wet filter paper and incubated at 25°C. The attached leaves were enclosed in a plastic bag along with the branches with a wet cotton ball inside. Sterile H2O was sprayed into the plastic bags twice daily to keep moisture conditions and incubated for 5 days. The experiment was repeated two times. Within 5 days, all the inoculated points showed lesions similar to those obsrved in the field, whereas controls were asymptomatic. The same fungus was re-isolated from these lesions with a frequency of 100%. B. dothidea has been reported to infect a broad range of hosts, including S. babylonica in the USA (Grand 1985). This is the first report of B. dothidea on S. babylonica in China. This finding provides crucial information on this high risk disease to willow and basis for identifying management strategies.</div>
</front>
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in China.</ArticleTitle>
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<Abstract><AbstractText>Salix babylonica L. (weeping willow) is an important ornamental tree commonly planted in China. Since 2018, a new disease with a high incidence has been observed on S. babylonica at the campus of Nanjing Forestry University (NFU), Nanjing, Jiangsu, China. The symptoms began as small dark brown lesions formed along the leaf margins and tips; and later became gray to brown in the center with dark brown borders. Small samples (3 to 4 mm2) from the lesion margins were surface-sterilized with 75% ethanol for 30 s and 1% NaClO for 90 s. Subsequently samples were, rinsed with sterile H2O, plated on potato dextrose agar (PDA) and incubated at 25°C. The same fungus was isolated in 95% of the samples. Pure cultures were obtained by monosporic isolation. A representative isolate, NFS1 was used for morphological and molecular characterization and deposited in China's Forestry Culture Collection Center (cfcc 54212). On PDA, colonies were initially white and gradually became grayish-green to dark gray from the center to the edge. After 1 week, colonies turned dark, and after 3 weeks black pycnidia developed on the surface of media. Conidia were one-celled, hyaline, smooth, and fusoid to ellipsoid. Conidia measurements were 23.0 ± 1.9 × 5.8 ± 0.7 µm (n = 50). The morphology matched the description of Botryosphaeria dothidea (Slippers et al. 2004). For an accurate identification, genomic DNA of NSF1 was extracted to amplify the internal transcribed spacer (ITS) region, the transcription eongation factor (tefa-1), beta-tubulin (β-tub), the large subunit (LSU), and small subunit (SSU) genes with the specific primers ITS1/ITS4 (White et al. 1990), EF1-728F/EF1-986R (Carbone and Kohn, 1999), βt2a/βt2b (Glass and Donaldson, 1995), LR0R/LR05 (Schoch et al. 2009), and NS1/NS4 (White et al. 1990), respectively. The sequences were deposited in GenBank (Accession Nos. MN826233 for ITS, MN855215 for tefa-1, MN855216 for β-tub, MN886965 for LSU, and MN886966 for SSU). A BLAST search of GenBank showed that the ITS, tefa-1, β-tub, LSU and SSU sequences of NSF1 were similar to those of B. dothidea KY788304 (Identity = 527/532; 99%), MG459974 (Identity = 247/247; 100%), MH724212 (Identity = 404/404; 100%), DQ377850 (Identity = 865/867; 99%), and KX091154 (Identity = 1,043/1,045; 99%), respectively. A maximum likelihood and Bayesian posterior probability-based phylogenetic analyses using IQ-tree v. 1.6.8 and Mr. Bayes v. 3.2.6 with the concatenated sequences (ITS, tefa-1, β-tub, LSU, and SSU) placed NFS1 in the clade of B. dothidea. Based on the multi-gene phylogeny and morphology, NFS1 isolate was identified as B. dothidea. To fulfill Koch's postulates, 20 detached and 20 attached healthy 10-week-old leaves from three 30-year-old S. babylonica plants at the campus of NFU were inoculated with 5-mm mycelial plugs of isolate NFS1 of 3-day-old cultures grown on PDA. Control leaves were treated with agar plugs. The detached inoculated leaves were placed in Petri dishes on a piece of wet filter paper and incubated at 25°C. The attached leaves were enclosed in a plastic bag along with the branches with a wet cotton ball inside. Sterile H2O was sprayed into the plastic bags twice daily to keep moisture conditions and incubated for 5 days. The experiment was repeated two times. Within 5 days, all the inoculated points showed lesions similar to those obsrved in the field, whereas controls were asymptomatic. The same fungus was re-isolated from these lesions with a frequency of 100%. B. dothidea has been reported to infect a broad range of hosts, including S. babylonica in the USA (Grand 1985). This is the first report of B. dothidea on S. babylonica in China. This finding provides crucial information on this high risk disease to willow and basis for identifying management strategies.</AbstractText>
</Abstract>
<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Ju</LastName>
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</AffiliationInfo>
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<Author ValidYN="Y"><LastName>Xu</LastName>
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</AffiliationInfo>
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<Author ValidYN="Y"><LastName>Sun</LastName>
<ForeName>Jian-Wei</ForeName>
<Initials>JW</Initials>
<AffiliationInfo><Affiliation>Nanjing Forestry University, 74584, No. 159 Longpan Road, Nanjing, China, 210037; 1043453872@qq.com.</Affiliation>
</AffiliationInfo>
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<Author ValidYN="Y"><LastName>Zhu</LastName>
<ForeName>Li-Hua</ForeName>
<Initials>LH</Initials>
<AffiliationInfo><Affiliation>Nanjing Forestry University, 74584, College of Forestry, No. 159 Longpan Road, Nanjing, Jiangsu, China, 210037; lhzhu@njfu.com.cn.</Affiliation>
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<Month>07</Month>
<Day>30</Day>
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<KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Botryosphaeria dothidea</Keyword>
<Keyword MajorTopicYN="N">Causal Agent</Keyword>
<Keyword MajorTopicYN="N">Fungi</Keyword>
<Keyword MajorTopicYN="N">Salix babylonica</Keyword>
<Keyword MajorTopicYN="N">new disease</Keyword>
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<name sortKey="Sun, Jian Wei" sort="Sun, Jian Wei" uniqKey="Sun J" first="Jian-Wei" last="Sun">Jian-Wei Sun</name>
<name sortKey="Xu, Wu" sort="Xu, Wu" uniqKey="Xu W" first="Wu" last="Xu">Wu Xu</name>
</country>
<country name="République populaire de Chine"><noRegion><name sortKey="Zhu, Li Hua" sort="Zhu, Li Hua" uniqKey="Zhu L" first="Li-Hua" last="Zhu">Li-Hua Zhu</name>
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